Thomas Burnett Jr. and several other passengers on United Airlines Flight 93 stormed the cockpit, foiling the hijackers' plan to crash the plane into the White House, and forced it to crash in a Pennsylvania field, killing all 44 people on board.

On October 6, 2009, my 20-year-old son Erik, took his own life. Since that sad and tragic day, an overwhelming sense of grief and despair propelled me into a search for answers. Answers that would provide me and others with comfort and hope. Some of those answers came from the many books I bought, but...